Page No.4
NDS2 issue A
Spicer SpecialityAxle Division - Technical Publications
© Spicer Speciality Axle Division
SECTION 2 ROUTINE MAINTENANCE
2.1 Hub bearing check should be carried out every 30000 miles (48000 km)
a) Before commencing checks, apply parking brake, raise wheels off ground and support axle on stands.
and remove brake drum (if fitted) .
WARNING!
NEVER WORK UNDER A VEHICLE SUPPORTED ONLY BY JACKS!
ALWAYS USE SUITABLE AXSLE STANDS!
b) Place magnetic base of a dial indicator on brake shoe / caliper and position dial indicator stem against a
convenient marked spot on face of Hub flange
c) With dial indicator in position pull hard but steadily on Hub flange and oscillate at same time until a
steady reading is achieved.
d) Without releasing the pressure, turn bearing so that dial indicator stem contacts marked spot and note
reading on indicator.
e) Push bearing flange hard and oscillate as before until a steady reading is achieved.
f) Without releasing the pressure, turn bearing so that indicator stem again contacts the marked spot and
note new reading on indicator.
g) The difference between readings is amount of mounted end play in bearing unit .
h) The mounted end play figure should not exceed 0.050mm for a new bearing.
NOTE:-
IF ORIGINAL BEARING UNIT IS RE-FITTED, AND END FLOAT IS MEASURED AT 1MM, WITH
HUB NUT FULLY TIGHTENED TO CORRECT TORQUE, THEN THE RETAINING CLIP WITHIN THE
UNIT IS DAMAGED / DISPLACED AND A NEW UNIT MUST BE FITTED.
2.2 To check front wheel ' Toe In '
a) To preserve correct steering and avoid excessive tyre wear, tracking (or alignment) of
front wheels should be checked periodically, as follows :-
Set front wheels in straight ahead position and at points level with wheel centre, measure
distance over hubs / wheel rims, both in front and behind axle centre.
For correct 'Toe In' front measurement 'B' should be 0" to 0.04" (0 to1mm) smaller than
rear measurement 'A' .
b) To allow for inaccuracies in wheels, same check should be made with vehicle moved an
equivalent to half of a wheel revolution (180°). Any adjustment required can be effected
by backing off clamp bolts in ball sockets and rotating tie (track) rod tube.
After adjustment, tighten clamp bolts to specified torque.
All steer axles supplied by Spicer Speciality Axle Division have their lockstops set to customer requirements.
It is important that when the power assisted steering is fitted, the steering gear is adjusted so that the hydraulic
assistance cuts out just before the lockstops come into contact with the axle beam, to avoid excessive loads being
transmitted through the steering linkages.
Incorrectly adjusted steering could lead to premature failure or shortened life of all steering components.
2.3 Check condition of brake pads as described in relevant brake manufacturers service manual.
‘A’
‘B’
Measure dimensions ‘A’ and ‘B’ over hubs / wheel rims
on horizontal centre line.
To give correct alignment ; dimension ‘A’ should be
0.0" to 0.04" (0 to1mm) greater than dimension ‘B’.
Fig. No.2
TP947
C
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